Study of cadences (3)
I believe the answer is:
den
'study' is the definition.
(den can mean an office or study)
'of cadences' is the wordplay.
'of' says the answer is hidden in the clue.
'DEN' can be found hidden inside 'cadences'.
(Other definitions for den that I've seen before include "Wild animal's lair" , "Private office" , "Gentleman's study or animal's lair" , "Animals' shelter" , "Home of the beast" .)